linux-kernel - [PATCH v2 5/9] perf/x86/rapl: Add wrapper for online/offline functions

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Date: Thu, 20 Jun 2024 12:56:59 +0000
From: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
To: <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
	<namhyung@...nel.org>, <mark.rutland@....com>,
	<alexander.shishkin@...ux.intel.com>, <jolsa@...nel.org>,
	<irogers@...gle.com>, <adrian.hunter@...el.com>, <kan.liang@...ux.intel.com>,
	<tglx@...utronix.de>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>,
	<x86@...nel.org>, <kees@...nel.org>, <gustavoars@...nel.org>,
	<rui.zhang@...el.com>, <oleksandr@...alenko.name>
CC: <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-hardening@...r.kernel.org>, <ananth.narayan@....com>,
	<gautham.shenoy@....com>, <kprateek.nayak@....com>, <ravi.bangoria@....com>,
	<sandipan.das@....com>, <linux-pm@...r.kernel.org>, Dhananjay Ugwekar
	<Dhananjay.Ugwekar@....com>
Subject: [PATCH v2 5/9] perf/x86/rapl: Add wrapper for online/offline functions

This is in preparation for the addition of per-core RAPL counter support
for AMD CPUs.

The CPU online and offline functions will need to handle the setting up and
migration of the new per-core PMU as well. The wrapper functions added
below will make it easier to pass the corresponding args for both the PMUs.

No functional change.

Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
---
 arch/x86/events/rapl.c | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
index be139e9f9ee0..70c7b35fb4d2 100644
--- a/arch/x86/events/rapl.c
+++ b/arch/x86/events/rapl.c
@@ -558,10 +558,10 @@ static struct perf_msr amd_rapl_msrs[] = {
 	[PERF_RAPL_PSYS] = { 0, &rapl_events_psys_group,  NULL, false, 0 },
 };
 
-static int rapl_cpu_offline(unsigned int cpu)
+static int __rapl_cpu_offline(struct rapl_pmus *rapl_pmus, unsigned int rapl_pmu_idx,
+			      const struct cpumask *event_cpumask, unsigned int cpu)
 {
-	const struct cpumask *rapl_pmu_cpumask = get_rapl_pmu_cpumask(cpu);
-	struct rapl_pmu *rapl_pmu = cpu_to_rapl_pmu(cpu);
+	struct rapl_pmu *rapl_pmu = rapl_pmus->rapl_pmu[rapl_pmu_idx];
 	int target;
 
 	/* Check if exiting cpu is used for collecting rapl events */
@@ -570,7 +570,7 @@ static int rapl_cpu_offline(unsigned int cpu)
 
 	rapl_pmu->cpu = -1;
 	/* Find a new cpu to collect rapl events */
-	target = cpumask_any_but(rapl_pmu_cpumask, cpu);
+	target = cpumask_any_but(event_cpumask, cpu);
 
 	/* Migrate rapl events to the new target */
 	if (target < nr_cpu_ids) {
@@ -581,11 +581,16 @@ static int rapl_cpu_offline(unsigned int cpu)
 	return 0;
 }
 
-static int rapl_cpu_online(unsigned int cpu)
+static int rapl_cpu_offline(unsigned int cpu)
 {
-	unsigned int rapl_pmu_idx = get_rapl_pmu_idx(cpu);
-	const struct cpumask *rapl_pmu_cpumask = get_rapl_pmu_cpumask(cpu);
-	struct rapl_pmu *rapl_pmu = cpu_to_rapl_pmu(cpu);
+	return __rapl_cpu_offline(rapl_pmus, get_rapl_pmu_idx(cpu),
+				  get_rapl_pmu_cpumask(cpu), cpu);
+}
+
+static int __rapl_cpu_online(struct rapl_pmus *rapl_pmus, unsigned int rapl_pmu_idx,
+			     const struct cpumask *event_cpumask, unsigned int cpu)
+{
+	struct rapl_pmu *rapl_pmu = rapl_pmus->rapl_pmu[rapl_pmu_idx];
 	int target;
 
 	if (!rapl_pmu) {
@@ -606,7 +611,7 @@ static int rapl_cpu_online(unsigned int cpu)
 	 * Check if there is an online cpu in the package which collects rapl
 	 * events already.
 	 */
-	target = cpumask_any_and(&rapl_pmus->cpumask, rapl_pmu_cpumask);
+	target = cpumask_any_and(&rapl_pmus->cpumask, event_cpumask);
 	if (target < nr_cpu_ids)
 		return 0;
 
@@ -615,6 +620,13 @@ static int rapl_cpu_online(unsigned int cpu)
 	return 0;
 }
 
+static int rapl_cpu_online(unsigned int cpu)
+{
+	return __rapl_cpu_online(rapl_pmus, get_rapl_pmu_idx(cpu),
+				 get_rapl_pmu_cpumask(cpu), cpu);
+}
+
+
 static int rapl_check_hw_unit(void)
 {
 	u64 msr_rapl_power_unit_bits;
-- 
2.34.1